Question 957728
Assign variables.
r, the airplane's rate if no jet stream.
w, the rate of the jet stream
t, the reference amount of time, not known
D, the distance flown flying with the jet stream
d, the distance flown flying against the jet stream
-
KNOWN VALUES GIVEN
w=300
D=4200
d=1400
UNKNOWNS
r, t.



ANALYZE USING DATA TABLE


________________________rate_____________time_____________Distance
WITH STREAM____________r+w_______________t________________D
AGAINST________________r-w_______________t________________d


Uniform Rates Rule for Travel gives a system of equations:
{{{system((r+w)t=D,(r-w)t=d)}}};
Reminder - the unknown variables are r and t.  Solve either equation for t in terms of r, and substitute this into the other equation, and finish finding a formula for r.  After this is done, just substitute the given values to compute r.